Angle adjustment device for grinding machine

ABSTRACT

A grinding machine includes a base with a U-shaped frame on the base. The U-shaped frame has two extensions and each have a first hole and a second hole which is an oval hole. A grinding roller is connected to the frame. An adjustment device includes a first shaft and a second shaft. The first shaft extends through a portion of the base and the two respective first holes of the extensions. The second shaft extends through the second holes of the two extensions. An eccentric sleeve and an adjustment member are located in the second hole of one of the extensions, and each have an eccentric hole. The adjustment member is mounted to the eccentric sleeve. The second shaft extends through the two eccentric holes. When rotating the adjustment member and the eccentric sleeve, the frame and the grinding roller are pivoted about the first shaft.

BACKGROUND OF THE INVENTION

1. Fields of the Invention

The present invention relates to an adjustment device, and moreparticularly, to an adjustment device for adjustment of an angle of agrinding roller of a grinding machine.

2. Descriptions of Related Art

The conventional grinding machine is disclosed in FIG. 1 and generallycomprises a base 1 with a feeding platform 2 located on the base 1, anda grinding roller 3 is located above the feeding platform 2 so as toform a space 5 between the grinding roller 3 and the feeding platform 2.A frame 4 is connected to the feeding platform 2 and located on one endof the grinding roller 3. The feeding platform 2 is parallel to thegrinding roller 3. An object (not shown) is fed from the feedingplatform 2 and positioned in the space 5, so that the grinding roller 3is lowered to grind the surface of the object. The space 5 has to be setaccording to the size of the object to he ground so as to obtain a flatand smooth surface on the object.

However, the frame 4 is connected to one end of the grinding roller 3which becomes a cantilever structure, and the grinding roller 3 may tiltafter a period of time of use. Therefore, the feeding platform 2 is notparallel to the grinding roller 3, and the tilt grinding roller 3 cannotgrind a flat and smooth surface on the object. The user has to adjustthe grinding roller 3 frequently.

The present invention intends to provide an adjustment device foradjusting the grinding roller of a grinding machine, so as to improvethe shortcomings mentioned above.

SUMMARY OF THE INVENTION

The present invention relates to an adjustment device for a grindingmachine, and comprises a base and a U-shaped frame is located on the topof the base. The U-shaped frame has a first extension and a secondextension, each of the first and second extensions has a first hole anda second hole which is an oval hole. Two tubular members are located onthe base, and the first and second extensions are mounted to tworespective outsides of the two tubular members. A feeding platform islocated on the base. A grinding roller is transversely connected to theframe.

An adjustment device is connected to the frame and has a first shaft anda second shaft. The first shaft has a fixing end and an operation end.The fixing end of the first shaft extends through the tubular member andthe first hole of the second extension. The operation end of the firstshaft extends through the other tubular member and the first hole of thefirst extension. The second shaft has an elongate body which has arestriction end and a connection end which extends through the secondhole of the second extension, the two tubular members and the secondhole of the first extension. The restriction end is sized larger thanthe second hole of the second extension. The connection end extendsbeyond the second hole of the first extension. An eccentric sleeve islocated in the second hole of the first extension and has a firsteccentric hole defined axially therethrough. An adjustment member has asecond eccentric hole defined axially therethrough. The eccentric sleevesecurely extends through the second eccentric hole. The adjustmentmember is engaged with the second hole of the first extension. Whenrotating the adjustment member and the eccentric sleeve, the frame andthe grinding roller are pivoted about the first shaft.

The primary object of the present invention is to provide an adjustmentdevice for a grinding machine, the transverse grinding roller isadjusted an angle relative to the feeding platform by rotating theadjustment member and the eccentric sleeve. The frame and the grindingroller are pivoted about the first shaft so as to ensure that the objectto be ground has a flat and smooth surface.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawingswhich show, for purposes of illustration only, a preferred embodiment inaccordance with the present invention.

BRIEF DESCRIPTION OF TI IE DRAWINGS

FIG. 1 is a side view to show a conventional grinding machine;

FIG. 2 is a perspective view to show the grinding machine with theadjustment device of the present invention;

FIG. 3 shows the fixing board connected to the first and second shaft ofthe adjustment device;

FIG. 4 is an exploded view to show the adjustment device of the presentinvention;

FIG. 5 is a cross sectional view of a portion of the adjustment deviceof the present invention;

FIG. 5 a shows a wrench is used to clamp the two flat faces of theeccentric sleeve;

FIG. 6 shows an end cross sectional view of the eccentric sleeve, theadjustment member and the second shaft in the second hole of the frame;

FIG. 7 shows that the grinding roller is tilt relative to the feedingplatform, and

FIG. 8 shows that the grinding roller is adjusted and parallel to thefeeding platform.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 2 to 6, the adjustment device for a grinding machineof the present invention comprises a base 10 and a U-shaped frame 20 islocated on the top of the base 10. The U-shaped frame 20 has a firstextension 21 and a second extension 210. Each of the first and secondextensions 21, 210 has a first hole 51 and a second hole 52, and each ofthe second holes 52 is a non-circular hole. In this embodiment, each ofthe second holes 52 is an oval hole. Two tubular members are connectedto the top of the base 10, and the first and second extensions 210 aremounted to two respective outsides of the two tubular members. A feedingplatform 30 is located on the base 10. A grinding roller 40 istransversely connected to the frame 20 so that an object is put on thefeeding platform 20 and positioned to a desired position where thegrinding roller 40 grinds the object.

An adjustment device 50 is connected to the frame 20 and has a firstshaft 53 and a second shaft 54. The first shaft has a fixing end 531 andan operation end 532. The fixing end 531 of the first shaft 53 extendsthrough the tubular member and the first hole 51 of the second extension210. The operation end 532 of the first shaft 53 extends through theother tubular member and the first hole 51 of the first extension 21. Afirst urging member 533 is connected to the operation end 532 extendingbeyond the first hole 52 of the first extension 21.

The second shaft 54 has an elongate body 541 which has a restriction end544 and a connection end 545. The connection end 545 extends through thesecond hole 52 of the second extension 210, the two tubular members andthe second hole 52 of the first extension 21. The restriction end 544 issized larger than the second hole 52 of the second extension 210 so thatthe second shaft 54 does not drop from the second hole 52 of the secondextension 210. The fixing end 531 of the first shaft 53 may have alarger end to prevent it from dropping from the second hole 52 of thesecond extension 210. The connection end 545 of the second shaft 54extends beyond the second hole 52 of the first extension 21.

An eccentric sleeve 542 is located in the second hole 52 of the firstextension 21 and has a first eccentric hole 5421 defined axiallytherethrough. The eccentric sleeve 542 has two flat faces 5423 definedin the outside thereof. An adjustment member 543 has a second eccentrichole 5431 defined axially therethrough. The eccentric sleeve 542securely extends through the second eccentric hole 5431 of theadjustment member 543. The eccentric sleeve 542 has a radial hole 5422which communicates with the first eccentric hole 5421. A bolt 55threadedly extends through the radial hole 5422 and contacts against theelongate body 541. The adjustment member 543 is engaged with the secondhole 52 of the first extension 21. The connection end 545 of the secondshaft 54 has outer threads 547 which are threadedly connected to asecond urging member 546. The adjustment member 543 has a lever 5432extending therefrom.

As shown in FIG. 7, after the grinding machine is assembled, thegrinding roller 40 is not parallel to the feeding platform 30 because ofthe accumulated tolerances. The assembler loosens the bolt 55 and thefirst urging member 533, and uses a wrench to clamp the two flat faces5423 of the eccentric sleeve 542 as shown in FIG. 5 a. The eccentricsleeve 542 is rotated relative to the elongate body 541 and drives theadjustment member 543 and the second hole 52 of the first extension 21of the U-shaped frame 20, so that the U-shaped frame 20 is pivoted aboutthe first shaft 53. Therefore, the grinding roller 40 is adjustedrelative to the feeding platform 30 to be parallel to the feedingplatform 30 as shown in FIG. 8. The bolt 55 is then tightened again, anda scale device is connected to the adjustment member 543 which is set ata desired position according to the scale device. The customers or userscan also rotate the eccentric sleeve 542 to initialize the position ofthe grinding roller 40, and by operating the first and second urgingmembers 533, 546 to set the desired position and height of the grindingroller 40.

When the users wants to adjust the grinding roller 40 after a period oftime of use, the first and second urging members 533, 546 are loosened,and the adjustment member 543 is rotated by operating the lever 5432 torotate the adjustment member 543 relative to the eccentric sleeve 542,in the meanwhile, the eccentric sleeve 542 does not rotate. Theadjustment member 543 drives the second hole 52 of the first extension21 and the U-shaped frame 20 is pivoted about the first shaft 53 so asto adjust the grinding roller 40 to be parallel to the feeding platform30 as shown in FIG. 8 again.

It is noted that the restriction end 544 is sized larger than the secondhole 52 of the second extension 210 so that the second shaft 54 does notdrop from the second hole 52 of the second extension 210. The fixing end531 of the first shaft 53 has a large end to prevent it from droppingfrom the second hole 52 of the second extension 210. As shown in FIG. 3,the fixing board 57 is connected between the fixing end 531 of the firstshaft 53 and the restriction end 544 of the second shaft 54 so as tosecurely position the first and second shaft 53, 54 to the U-shapedframe 20, such that one end of the grinding roller 40 can be adjusted.

While we have shown and described the embodiment in accordance with thepresent invention, it should be clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

What is claimed is:
 1. An adjustment device for a grinding machine,comprising: a base; a U-shaped frame located on a top of the base havinga first extension and a second extension, each of the first and secondextensions having a first hole and a second hole, each of the secondholes being a non-circular hole, two tubular members on the base, thefirst and second extensions mounted to two respective outsides of thetwo tubular members; a feeding platform located on the base; a grindingroller transversely connected to the frame, and an adjustment deviceconnected to the frame and having a first shaft and a second shaft, thefirst shaft having a fixing end and an operation end, the fixing end ofthe first shaft extending through the tubular member and the first holeof the second extension, the operation end of the first shaft extendingthrough the other tubular member and the first hole of the firstextension, the second shaft having an elongate body which has arestriction end and a connection end, the connection end extendingthrough the second hole of the second extension, the two tubular membersand the second hole of the first extension, the restriction end beingsized larger than the second hole of the second extension, theconnection end extending beyond the second hole of the first extension,an eccentric sleeve located in the second hole of the first extensionand having a first eccentric hole defined axially therethrough, anadjustment member having a second eccentric hole defined axiallytherethrough, the eccentric sleeve securely extending through the secondeccentric hole, the adjustment member engaged with the second hole ofthe first extension.
 2. The adjustment device as claimed in claim 1,wherein the eccentric sleeve has two flat faces defined in an outsidethereof.
 3. The adjustment device as claimed in claim 1 wherein a firsturging member connected to the operation end extending beyond the firsthole of the first extension, the connection end of the second shaft hasouter threads which are threadedly connected to a second urging member.4. The adjustment device as claimed in claim 1, wherein the eccentricsleeve has a radial hole which communicates with the first eccentrichole, a bolt threadedly extends through the radial hole and contactsagainst the elongate body.
 5. The adjustment device as claimed in claim1, wherein the adjustment member has a lever extending therefrom.
 6. Theadjustment device as claimed in claim 1, wherein the adjustment devicehas a fixing board which is located between the fixing end of the firstshaft and the restriction end of the second shaft.
 7. The adjustmentdevice as claimed in claim 1, wherein the two second holes each are anoval hole.